What is the best B2B email database in the UK?

Cognism, for UK-focused teams that need accuracy and a defensible compliance position. Lusha and Kaspr are cheaper self-serve options with solid UK and European coverage and free plans to test data quality before paying.

Is it legal to buy a B2B email list in the UK?

Buying a list is legal; using it is the test. You can email "corporate subscribers" (Ltd, PLC, LLP) without prior consent if you identify yourself and offer an opt-out, but sole traders and partnerships need consent, and you must tell people you hold their data within a month under UK GDPR.

How accurate are B2B email databases?

It varies widely. Verified emails (validated against the mail server) bounce far less than guessed or pattern-based ones. Expect strong providers to quote 95%+ deliverability on verified data, while high-volume databases can see 15–25% bounce rates, especially outside their core region.

What is the best B2B email database in the UK?

Cognism, for UK-focused teams that need accuracy and a defensible compliance position. Lusha and Kaspr are cheaper self-serve options with solid UK and European coverage and free plans to test data quality before paying.

Is it legal to buy a B2B email list in the UK?

Buying a list is legal; using it is the test. You can email "corporate subscribers" (Ltd, PLC, LLP) without prior consent if you identify yourself and offer an opt-out, but sole traders and partnerships need consent, and you must tell people you hold their data within a month under UK GDPR.

How accurate are B2B email databases?

It varies widely. Verified emails (validated against the mail server) bounce far less than guessed or pattern-based ones. Expect strong providers to quote 95%+ deliverability on verified data, while high-volume databases can see 15–25% bounce rates, especially outside their core region.

Ranked · UK · Updated June 2026

The best B2B email database providers for UK teams

In short

For verified UK B2B email, Cognism leads on accuracy and GDPR compliance, while Lusha and Kaspr are the cheaper self-serve options. ZoomInfo and Apollo bring volume but skew US, where bounce rates can climb. Here's how the five compare, and the legality you need to get right.

1

Cognism

GDPR-first sales intelligence with phone-verified mobile numbers, strongest across the UK & EMEA.

8.1 /10

Verified work emails backed by a compliance-first posture (notified-jurisdiction screening and Article 14 notification), which makes it the safest UK email data of the five. The catch is sales-led, annual pricing.
- Entry price ~£12,000/yr
- Pricing Demo-gated
- Free plan No
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2

Lusha

Self-serve B2B contact data with a one-click Chrome extension and transparent, published pricing.

7.3 /10

Reliable UK and US emails via a self-serve Chrome extension, with published pricing and a free plan. Email reveals cost just one credit each (unlike phone), so it's an efficient way to build email lists.
- Entry price from $449/yr
- Pricing Published
- Free plan Yes
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3

Kaspr

LinkedIn prospecting with one-click mobile and email reveals, strongest across Europe, backed by Cognism.

7.0 /10

Strong European email coverage, with unlimited B2B (generic company) emails on paid plans and a free tier. Weigh its 2024 CNIL fine if you operate in the EU and need a defensible sourcing story.
- Entry price from £468/yr
- Pricing Published
- Free plan Yes
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4

ZoomInfo

The deepest US B2B database, with intent, visitor-ID and enrichment in one platform, at an enterprise price.

7.3 /10

An enormous email database, deepest in the US. UK coverage is solid but the price is enterprise-only, and accuracy decays on older records; verify before high-volume sends.
- Entry price ~$14,995/yr
- Pricing Demo-gated
- Free plan No
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5

Apollo

All-in-one prospecting (database, sequencer and dialer) at a fraction of the enterprise price, strongest in the US.

7.4 /10

Huge volume and a genuinely usable free plan, but deliverability is the watch-out: independent tests report 15–25% bounce rates, and higher still outside the US.
- Entry price from $588/yr
- Pricing Published
- Free plan Yes
Visit Apollo
We may earn a commission when you buy through links on this site. It never affects our scores, rankings or verdicts. See our methodology.

Read our Apollo review →

Every score comes from the same rubric, applied identically. See the consolidated pricing table for all providers side by side , or check whether buying B2B data is legal in the UK .

Frequently asked questions

What is the best B2B email database in the UK?: Cognism, for UK-focused teams that need accuracy and a defensible compliance position. Lusha and Kaspr are cheaper self-serve options with solid UK and European coverage and free plans to test data quality before paying.
Is it legal to buy a B2B email list in the UK?: Buying a list is legal; using it is the test. You can email "corporate subscribers" (Ltd, PLC, LLP) without prior consent if you identify yourself and offer an opt-out, but sole traders and partnerships need consent, and you must tell people you hold their data within a month under UK GDPR.
How accurate are B2B email databases?: It varies widely. Verified emails (validated against the mail server) bounce far less than guessed or pattern-based ones. Expect strong providers to quote 95%+ deliverability on verified data, while high-volume databases can see 15–25% bounce rates, especially outside their core region.